The chemical milling process is highly versatile when working with thin sheet metal. Check the following information to help you with your component design: Metal thickness suitable for etching 0.002" up to 0.080" (0.05 to 2mm). Thicker metals when etched will have a noticeable profiled edge "cusp" as detailed. Metals of any thickness can be surface etched Design tolerances Click to enlarge Design tolerances - In certain instances, tolerances can be improved. Please contact our engineers for further information. Design tolerances Click to enlarge Design tolerances - In certain instances, tolerances can be improved. Please contact our engineers for further information. Forming - we can form components using hard tooling or using jigs for a small quantity. We can "half-etch" to create fold lines, so that the component can be formed by hand. Our engineers will be pleased to advise you on specific components and costs. Metal Flatness - this is determined by the standard provided by the steel mill. Tension leveled material is available when required. We operate within British Standard limits.